Gainward GF2 problem

System is up and running exept for games. Eveytime I try a game, screen either goes blank or get vertical lines and freezes. I have removed drivers and re-installed from Gainward and N-Vidia. Same. I have tried many options but am stuck. Please help. I have lots of cooling.

Have you just gotten this card? and did it ever work on games before? Vertical lines usually signal a vidboard heating or memory problem...do you have the card overclocked anymore then it already is from gainward? and is your install of XP fresh or upgrade?